Control means for refrigerating apparatus



' Nov. 14, 1939. H SMITH ETAL 2.179.866

CONTROL MEANS FOR REFRIGERATLNG APPARATUS Filed Dec. 23, 1938 INVENTO 5,

17611111 Kiryan/ THEIR ATTORNEY.

I Patented Nov.1 4 ,1939 2,179,866

UNITED STATES PATENT OFFICE oon'raor. MEANS FOR- REFEIGERATING APPARATUS Henry A. Smith, Phillipsburg, N. J., and John Kirgan, Brooklyn, N. Y., assignors to Ingersoll-Rand Company, Jersey City, N. J., a corporation of New Jersey Application December 23, 1938, Serial No. 247,358

10 Claims. (Cl. 62-152) The present invention relates to a control theevaporator. For the sake ofsconvenience, a means for a refrigerating apparatus and more two chamber evaporator has been illustrated but particularly it relates to a water refrigerating it is apparent that any number of chambers apparatus having an evacuator for each chammay be formed in the evaporator without de- 5 her of a multi-chamber evaporator wherein parting from the scope of this invention. 5 means are provided to render the evacuators in- The refrigerant employed in this particular efiective and the corresponding chambers inembodiment is water which is admitted to the active for refrigerating purposes. When ever chamber 3 by the conduit 9 and to the chamber centrifugal evaporators are employed to, remove 5 by the conduit I l. The refrigerant, after chillin vapor from awater evaporator, it is often deing, is removed from the evaporator through the 10 sirable to render a chamber inactive due to a conduit l3 which opens into a well l5 formed change in the load on the apparatus, and, to this at the bottom of the chamber 5. Since the wall end, dampers are interposed between the evap- I does not extend to the bottom wall of the evaporator and the evacuators. When such a damper orator l, refrigerant may flow from chamber 3 is closed, the respective evacuator is rendered ininto chamber 5 and thus to the outlet conduit 15 effective to remove water vapor from its asso- I3. The conduit l3 leads to the point where ciated chamber. The objection to such arrangea the cooling effect of the refrigerant is to be ment, when employed with an evaporator having utilized.

a common cool refrigerant outlet for all the Both chambers 3 and 5 are provided with va.

chambers in the evaporator, that the cooled por outlet ports Ill and I9 through which water refrigerant coming from an active chamber is vapor is removed by the evacuators 2| and 23 mixed with the non-cooled or heated refrigerant associated with. the ports. These evacuators coming from an inactive chamber, with the re are of the centrifugal type and are directly consult that the apparatus becomes relatively innected by the shaft 25 to the driving motor 21.

25 emcient. Since the shaft 25 actuates both evacuators, it 25 It is, accordingly, an object of the present inis apparent that whenever the motor 21 is opvention to provide means for the cooled refrigerated, both the cvacuators will function to reerant in all chambers of an evaporator whether move water vapor from their respective chamactive, or inactive. bers. A common condenser 29 receives the water It is another object to provide means whereby vapor removed from the evaporator chambers 30 30 the vapor in an inactive chamber of an evaporaby the evacuators 2i and 23. I tor may be evacuated by an evacuator associated With this construction, so long as the refrigwith an active chamber. erating load remains constant, both evacuators Another object is to provide means in a multiwill withdraw vapor from the evaporator chamchamber refrigerating apparatus to render a bers and, since the evacuators are identical, apchamber inactive. I proximately the same vapor pressure will exist A further object is to provide inter-connected in both chambers 3 and 5. However, if the dedampers whereby the number of active evap mand forrefrigerant should fall, it is necessary orator chambers of a multi-chamber refrigerat-l o, i SOme way, stop the removal of Vapor from ing apparatus may be varied without heating at least'one chamber in order that no excessive 40 the refrigerant flowing from the active chambers. refrigeration 0f e W r in e C ambers shall Still another object is to provide refrigerating 1 TO this end a damper 3| is p voted on apparatus wherein. one evacuator may remove pin 33 in the vapor outlet port l9. When the vapor from one or more chambers of an evaporadamper M is in the position which opens the tor. f vapor port #9, the evacuator 23 can remove vapor 45 These and other objects will be apparent from from the chamber 5. However, when the damper the following description of which the drawing is ,in the position shown in the drawing, the forms a part and wherein is illustrated a reevacuator, even though. operating, cannot refrigerating apparatus incorporating the present move vapor from the chamber 5. It is thus apinvention. parent that, if no other means were provided, 50

The refrigerating apparatus comprises an the refrigerant sprayed into chamber 5 would evaporator l which is divided into two chambers be removed therefrom at the same temperature tand 5 by the wall 'l'which extends'from the asit entered.

top wall of the evaporator I and terminates at Under such conditions "the refrigerant flowing a point substantially near the bottom wall of through'the outlet conduit l3 would beat the 55 which would permit communication between thechambers 3 and 5 at all times were not damper 31 provided. The damper 31 is designed to pivotabout pin 39 fastened tothe partition wall 1. When the damper 3| is open, it is desirable to have damper 31 closed and when damper 3| is closed, the damper 31 should be open. For this reason, an appropriate linkage is provided which comprises an arm 4| securely fastened to damper 3|, an arm 43 securely fastened to damper 31 and a .lever 45 pivotally connected to these arms.

At the pivot between arm' 4| and lever 45 the actuating rod 41 is likewise pivoted. This rod extends through the wall of evaporator and is threaded at its outer end. a At the point where the rod 41 passes through the wall of evaporator packing 49 held by the packing nut 5| prevents It will be observed that when the hand wheel 55 is rotated, it will move the rod 41 longitudinally since it threadedly engages the rod 41. When the rod 41 is in its innermost position, as shown in the drawing, the damper 3| is closed and the damper 31 is open. In order to open the damper 3| and close the damper 31, the rod is moved out- 40 wardly from the evaporator wall by appropriate rotation of the hand wheel 55.

It will thus be seen that means for opening and closing the dampers, while maintaining proper coordination of the dampers, is provided. Obviously, this invention may be modified by those skilled inthe art without departing from the scope of this invention and the invention is not to be limited save as defined in the appended claims.

We claim: 1. In a refrigerating apparatus, an evaporator a wall having a vapor port therein dividing the evaporator into two chambers and extending substantially to the bottom of said evaporator, means defining a vapor outlet port for each chamber, a separate evacuator for each chamber to remove vapor from the chambers through said vapor outlet ports, means to supply refrigerant to each chamber,'a refrigerant outlet conduit for the evaporator, a damper for the wall vapor port, a damper for a vapor outletport, levers connecting said dampers, and means to operate said levers to open and close said ports.

2. In a refrigerating apparatus, an evaporator, a wall having a vapor port therein dividing the evaporator into two chambers and extending substantially to the bottom of said evaporator, means defining a vapor outlet port. for. each chamber, a separate evacuator for each chamber to remove vapor from the chambers through said'vapor outlet ports, meansto supply refrigerant 'to each chamber, a refrigerant outlet conduitfor-the evaporator, a damper for the wall vapor port, [a damper for a vapor outlet port, means to operate said dampers to open and close said ports so arranged that when the vapor outlet port is closedsaid wall port is opened.

3. In a refrigerating apparatus, an evaporator, a wall having a vapor port therein dividing the evaporator into two chambers and extending substantially to the bottom of said evaporator, means means to operate said dampers to open and close said ports so arranged that whenever said vapor outlet port is closed rendering its evacuator. in-

effective said Wall vapor port is open to permit communication between the vapor space in said chambers.

4. In a refrigerating apparatus, an evaporator, a wall having a vapor port therein dividing the evaporator into two chambers and extending substantially to the bottom of said evaporator, means defining a vapor outletport for each chamber, a separate evacuator for each chamber to remove vapor from the chambers through said vapor outlet ports, means to supply refrigerant to each chamber, a refrigerant outlet conduit for the evaporator, a damper for the wall port, a damper for a vapor outlet port, and means to operate said dampers to open and close said ports including a threaded rod extending into the evaporator, a casing mounted on the evaporator through which said 'rod extends, va ,threaded handle engaging the threaded .rod and rotating without longitudinal movement on said casing whereby said rod may be moved longitudinally, and a series of inter-connecting levers connecting said rods to said dampers arranged to move said wall port damper to open said wall port and to ,move said vapor outlet damper to close said 'vapor outlet damper upon longitudinal movement of the rod into said evaporator and to open said vapor outlet damper and close said wall port damper upon longitudinal movement of the rod away from said evaporator. r

5. In a refrigerating apparatus,-an evaporator, a wall having a vapor port therein dividing the evaporator into two chambers and extending substantially to the bottom of said evaporator, means defining a vapor outlet port for each chambar, a separate evacuator for each chamber .to remove vapor from the chambers through said vapor outlet ports, means to supply refrigerant to each chamber, a refrigerant outlet conduit for the evaporator, a damper for the wall port, a damper for a'va'por outlet port, and means to move said dampers to open and closesaid ports including longitudinally movable means extending into an evaporator chamber, means mounted on theevaporator to support the said movable means, means to move said movable means, and means connecting said movable means and the dampers so arranged that when one damper is in its closed position the other is in its open poone chamber to the other, a port in the first said means, means defining a vapor outlet for each chamber, evacuating means for each chamber to remove vapor through each vapor outlet, means to close one of said vapor outlets and render the associated evacuator ineffective, a second means to close said port, and means to operate the first closing means and the second closing means so arranged that when one of said closing means is in its closed position the other is in its nonvclosing position.

7. In a refrigerating apparatus. an evaporato means dividing said evaporator into two chambers arranged to enable refrigerant to flow from one chamber to the other, a vapor port in the first said means, means defining a vapor outlet for each chamber, evacuating means for each chamber to remove vaporthrough each vapor outlet, means to close one of said vapor outlets and render the associated evacuator ineffective, a second means to close said vapor port, and means to operate both said closing means including means connecting both said closing means, and longitudinally movable means associated with said connecting means adapted upon movement to move one of said closing means to its closing position while moving the other to its non-closing position.

8. Ina refrigerating apparatus, an evaporator, means dividing said evaporator .into two chambers arranged to enable refrigerant to flow from one chamber to the other, a vapor port in said dividing means, means defining a vapor outlet for each chamber, evacuating means for each chamber to remove vapor through each vapor outlet, primary means to close one of said vapor outlets and render the associated evacuator inefiecti've, secondary means to close said vapor port, and means to move said primary closing means to the closed position and the secondary closing means to the open position including means connecting said primary and secondary closing means, means to move said connecting means, and means to move the last said means. 9. In a refrigerating apparatus, an evaporator. means dividing said evaporator into two chambers arranged to enable refrigerant to iiow from one chamber to the other, a vapor port in said dividing means, means defining a vapor outlet for each chamber, evacuating means for each chamber to remove vapor through each vapor outlet, primary means to close one of said vapor outlets and render the associated evacuator ineifective, secondary means to close said port. and means to move said primary closing means tothe closed position and the secondary closing means to the open position comprising a connectlng means for the primary and secondary closing means, means to move the connecting means, means on the evaporator to support the last said means; and means to move the i said means.

10. In a refrigerating apparatus, an evaporator, means to divide the evaporator into a plurality of chambers arranged to enable reirigerant vapor to flow from one chamber to another, a vapor port in said dividing means, a vapor outlet port for each chamber, a separate evacuator for each chamber to remove vapor from the chambers through said vapor outlet ports, means to supply refrigerant to each chamber, a refrigerant outlet conduit for the chambers of the evaporator, means to close a vapor outlet port, means to close said vapor port, and means to open and close the vapor outlet port closing means and said vapor port closing means.

- HENRY A. SMITH.

JOEW KIRGAN. 

